adafruit gpio

=============================== Description ===============================This article takes A5 as an example, to give 8 kinds of our company commonly used interface of the extremely streamlined driver, only should refer to, when using, please self-correcting logic and drive frameThe contents are as follows:1. Gpio2. External interrupt3. LEDs4. UART5, I²c6. SPI7, PCK8, Gadget=============================== Gpio ===============================The

The operation of Gpio in an embedded device is the most basic operation. The general practice is to write a separate driver, and most of the examples on the web are like this. In fact, there is a generic Gpio operating interface under Linux, that is, I want to introduce the "/sys/class/gpio" way.First, see if there is a "/sys/class/

Label:/** MD.C** Created on:2015 Year July 16* Author:administrator*/ /** LEDWC.C** Created on:2015 Year July 16* Author:administrator*/#include "xparameters.h"/* Peripheral Parameters */#include "xgpio.h"/* GPIO data struct and APIs */#include "xil_printf.h"#include "xil_cache.h"#define Gpio_bitwidth 8 /* This is the width of the GPIO */#define GPIO_DEVICE_ID Xpar_axi_gpio_0_device_id//device ID#define

may also be different. For example, for touch screens, TSC2003 only supports single touch, while ft5x06 supports multi-touch. When you get the touch coordinates, the former only needs to get the data of one point, and the latter needs to get the data that is currently several points and then read the coordinates of all the points. Hardware resources such as GPIO and interrupts are typically used in driver operations, such as SDA and SCL, w

1. Raspberry Pie Display Temperature Import Commands def get_cpu_temp (): tempfile = open ("/sys/class/thermal/thermal_zone0/temp") cpu_temp = Tempfile.read () tempfile.close () return float (cpu_temp)/1000 # Uncomment the next line if you want the temp I n Fahrenheit #return float (1.8*cpu_temp) +32 def get_gpu_temp (): gpu_temp = Commands.getoutput ('/opt/vc/ Bin/vcgencmd measure_temp '). Replace (' temp= ', '). Replace (' \ ' C ', ') return float (gpu_temp)

Well, I admit that this is the first example of learning from books. I started with the Raspberry red edition and version 2. I was pleasantly surprised to see that such a small card computer could do so many things! The installation of the system is successful, and the startup, installation program, remote desktop, and SSH logon are all smooth, that is, the installation of XBMC is not good, and all versions are not good, after it is started up, the Operation will soon fail. I don't know why. T

in the previous article, there was an article based on Arm-contexa9-linux Drive development: How to get the unique ID number on the boardin that article, you can refer to it in detail. At that time I used a simple character device driver framework, the final ID number through the Read method can read the ID, but it is too cumbersome, there is no easier way? In fact, this method is called IO address mapping, and today we want to say is the IO address dynamic mapping method, static mapping is too

things can be initialized and used. 2) then MDP and lcdc need to run and understand what operations must be done to make the two chips work. This generally requires reference to the QC code, because after all, we do not know much about the chip. Apart from the clock, we do not know which registers need to be initialized and which ones are not needed. 3) The last step is the initialization of the Panel. Here the main difference is the use of asynchronous screen or synchronous screen problem, her

setupswo (void) { Uint32_t * dwt_ctrl = (uint32_t *) 0xe0001000; Uint32_t * tpiu_prescaler = (uint32_t *) 0xe0040010; Uint32_t * tpiu_protocol = (uint32_t *) 0xe00400f0; CMU-> hfperclken0 | = cmu_hfperclken0_gpio; Gpio-> route | = gpio_route_swopen; # If defined (_ efm32_giant_family) Gpio-> route = (gpio-> route ~ (_ Gpio_route_swlocatio

porting of the nodes around, directly at the board level. DTS can be changed.The following example directly references a node in DTSi and adds/modifies new property information to itKEYIn the device tree, a key-value pair is a way to describe a property, for example, a Linux driver can find a device node through the "compatible" attribute in the device node.The Linux device tree syntax defines a number of attributes that are canonical, including:compatible, address, interrupt , etc., which can

merged into the device node, and the same attributes are overwritten, and references can be used to prevent the transplant from looking around for nodes, directly at the board level. DTS can be changed.The following example directly references a node in DTSi and adds/modifies new property information to itKEYIn the device tree, a key-value pair is a way to describe a property, for example, a Linux driver can find a device node through the "compatible" attribute in the device node.The Linux devi

1.SoC Linux Bottom drive composition and status To allow Linux to run on a brand new arm SOC, there are a number of underlying support, such as timer beats, interrupt controllers, SMP booting, CPU HotPlug, and the underlying GPIO, clock, Pinctrl, and DMA hardware packages. Timer beats, interrupt controllers, SMP boot, and CPU hotplug are relatively not as cluttered as the early Gpio, clock, Pinctrl, and DM

Tags: Raspberry Pi wiringpi Zookeeper 1. Void pinmode (INT pin, int mode ); This function sets the Input and Output Modes of the pin and the input and output modes of PWM. InWiringpi onlyPin 1 (bcm_gpio 18) supports PWM output. 2. Void digitalwrite (INT pin, int value ); This function is used to set the level of the pin. When we write high or low (1 or 0), the mode of the pin must be the output mode. 3. Void digitalwritebyte (INT value ); This function can write 8-bit bytes to 8

interfaces. The L3 interface pins are connected to the three gpio output pins of S3C2440 respectively, and the L3 interface is controlled through gpio. The uda1341ts audio chip integrates digital audio and mixer functions. The digital audio function can play a digital sound or recording sound. The mixer is used to control the volume of various inputs/outputs, and is controlled through the L3 interface. Fi

========================================================== ====Author: yuanlulu Http://blog.csdn.net/yuanlulu No copyright, but please keep this statement for reprinting========================================================== ==== I wrote a driver. It took a long time to get it done because it was dependent on the symbol exported by another module. Let's summarize my practices. For ease of expression, I call the depended module Module B, and my own module is module. Step 1: Export the symbol

BBB lesson four innings: simple LED control experimentLearn the BBB board ultimate goal is to do the same with the imagined microcontroller control. But control is not the same idea at all (Linux in essence, the control of hardware devices, read and write under the device related to virtual files), the study of the days of the head is big or no progress. Guest articles. There is no unified statement, it is expected that the BBB board of different years. and the installed version number of the sy

library is installed, directly to use it, and look at the code, it is almost unbearable to stare at the C code. For ensemble projects without the pursuit of speed, it is quite suitable.This article first introduces several of the most commonly used basic protocol implementation, the usual, first on the source portalGPIO The Gpio port is simple, either input or output. Install the Development library first:sudo apt-get install Python-rpi.gpioAnd then